Thomas j



(No Model.)

T. J. HENRY.

DENTAL FOIL.

. Patented May 1, 1888.

INVENTOR N PETERS, Phckrlilhogmphur. Wnshinglorv, n.c,

NITED STATES THOMAS J. HENRY, OF NEW YORK, N. Y.

DENTAL FOIL...

SPECIFICATION forming part of Letters Patent No. 382,085, dated May 1, 188a.

Application filed November 2 1887. Serial No. 256,326. (No specimens.)

To all whom it stay concern.-

Be it known that I, THOMAS J. HENRY, of the city, county, and State of New York, have invented a new and useful Improvement in Dental Foil, of which the following is a full,

clear, and exact description.

The invention consists in a sheet of dental foil having depressions causing breaks or punctures in the continuity of its fiber,and not mere superficial indentations for purposes of ornamentation, substantially as set forth and claimed.

In order that my invention may be clear] understood, 1 will give a detailed description of the process, which, however, forms no part of the matter claimed in the present application, as it is my intention to file a separate application therefor, the means employed in carrying on the same, and the nature of the improved gold-foil thus produced.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure l is a perspective view illustrating the improved foil in process of manufacture. Fig. 2 is an exaggerated plan view of a portion of gold-foil thus treated. Fig. 3 is an eXag gerated sectional view of the same, taken on the line m m, Fig. 2.

A sheet of the gold-foil, A, to be treated by my process, either before or after trimming,is

' laid out flat on a bed, 13, which I prefer to form of several superposedlayers of common blotting-paper, so that a fresh working-surface can be readily obtained when desired by removing the top layer. The bed 13 may, however, be made of rubber, leather, or any other substance that will yield to the individual pro- 40 jections of a roughened surface when pressed A,thus supported I then run under considerable pressure a roller, C,of metal or other hard substance,havinga roughened surface, the projections studding which form depressions E in the surface of the foil and break the continuity of the fiber of the metal, making it slightly foraminous.

I find best adapted for the roller 0 asurface studded with diamond pointed projections formed by cutting twoseries of equidistant V- shaped grooves in the substance of the roller, crossing at an angle, as is commonly seen on rasps and kindred appliances. The dull points act to slightly open the metal of the foil at the bottom of the depressions formed by the projections on the roller,leaving minute punctures H, which are an important elementin softening the foil. These punctures, however, do not give a ragged edge to the foil when cut,nor to the out edge of the foil, the continuity of the metal being not totally destroyed thereby, but the metal only excessively thinned, so as to open slightly. By this process the size of a trimmed leaf is not in the least diminished, as occurs with the ordinary wrinkling and corrugation of goldfoil, for while in the latter cases the area of the leaf is drawn on. to form the wrinkles and corrugations, by my process the thickness only of the metal is drawn on for the depressions.

I am aware that wrapping tin-foil has been ornamented by first matting its surface and then embossing a pattern on the matted foil by means of a pair of embossing-rolls, and I 

